Get a segment's audience-size history
Contacts
Get a segment's audience-size history
Return the audience-size-over-time series ({ contact_count, snapshot_at } points) recorded after each refresh tick — the data behind the “Audience over time” chart (Braze / Iterable / Customer.io parity). Defaults to the last 30 days; narrow with optional since / until (ISO-8601) and limit (1-1000, default 200) query parameters.
GET
Get a segment's audience-size history